Abstract
Industrial residues from black carrot were valorized for using them as a raw material to produce anthocyanin pigments, which were obtained as concentrated extracts and microcapsules.
The anthocyanins were extracted by citric, tartaric, and lactic acids to prevent degradation. Concentrated extracts were obtained by 80% of water reduction, whereas microcapsules were prepared by spray drying using gum arabic as a carrier agent.
The effect of pH and temperature on the anthocyanin content and coloration was assessed. In addition, the shelf-life of pigment products was determined for 360 days of storage at 4 and 20 °C, measuring anthocyanins concentration, color, and total phenolic retention.
Black carrot residues resulted in an excellent material for pigments products preparation. Concentrated extracts reached up to 7000 mg/L of anthocyanins, high antioxidant activity, and dark red color. The obtained products showed high color stability at 2–7 pH range and temperature stress from 20 to 90 °C. Furthermore, the concentrated extract showed 80% of anthocyanins preservation and 90% of color retention after storage for 360 days at 4 °C. Anthocyanin microcapsules exhibited 280 mg/L of anthocyanins with pink, red coloration, maintaining 50% of anthocyanins after storage for 180 days at 20 °C.
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Abbreviations
- A:
-
Absorbance
- A0 :
-
Anthocyanins absorbance at initial conditions, time=0
- At :
-
Anthocyanins absorbance at subjected conditions t= t
- a0 :
-
Positive=redness/negative=greenness of the control sample at initial conditions
- a*:
-
Positive=redness/negative=greenness at final conditions
- ABTS:
-
2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid
- b0 :
-
Positive=yellowness/negative=blueness of the control sample at initial conditions and final conditions
- b*:
-
Positive=yellowness/negative=blueness
- C:
-
Citric acid
- CC:
-
Concentrated extracts from black carrot residues by citric acid
- CD:
-
Color density
- CR%:
-
Percentage of color retention
- CRE:
-
Extract from black carrot residues by citric acid
- CWE:
-
Extract from fresh black carrot by citric acid
- D:
-
Pathlength, the distance the light travels through the sample
- DPPH:
-
1,1-diphenyl 2-picrylhydrazyl
- Dw:
-
Dry weight
- Ε:
-
Molar extinction coefficient
- FD:
-
Dilution factor
- Fw:
-
Fresh weight
- GAE:
-
Galic acid
- KCl:
-
Potassium chloride
- HCl:
-
Chloride acid
- L:
-
Lactic acid
- L0 :
-
Lightness/darkness; 0–100 of the control sample at initial conditions
- L*:
-
Lightness/darkness; 0–100 at final conditions
- λ max :
-
Maximum wavelength
- LRE:
-
Anthocyanin extract from black carrot residues by lactic acid
- LWE:
-
Anthocyanin extract from fresh black carrot by citric acid
- MAC:
-
Monomeric anthocyanin content
- MGA:
-
Gum arabic microcapsules from black carrot residues
- MW:
-
Molecular weight
- PC:
-
Polymeric color
- PPC%:
-
Percentage of polymeric color
- T:
-
Tartaric acid
- TAC:
-
Total anthocyanin content
- TCD:
-
Total color difference
- TE (TROLOX):
-
6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid
- TPC:
-
Total phenols content
- TRE:
-
Anthocyanin extract from black carrot residues by tartaric acid
- TWE:
-
Extract from fresh black carrot by citric acid
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Acknowledgements
The authors thank the Consejo Nacional de Humanidades Ciencia y Tecnología (CONAHCYT) for the scholarship granted to E. Hernández-Acosta and E. López-Solorzano to study Environmental Sciences PhD, within the installations of the ‘Tecnológico Nacional de México-Toluca’ (No. 788926).
Funding
This study was supported by the Tecnológico Nacional de México (TECNM-11342.21-P and Consejo Nacional de Humanidades, Ciencias y Tecnologías (CF-2023-G-859).
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Novelty Statement
The valorization of black carrot industrial residues related to Deep purple variety resulted in a high content of anthocyanins, constituting a potential raw material of reuse to produce a line of food pigments as concentrated extracts and microcapsules.
Anthocyanin concentrated extracts reached up to 7000 mg/L of anthocyanins and dark red color, showing 80% of anthocyanins preservation and 90% of color retention during storage for 360 days at 4°C. Color stability was observed at 2-7 pH range and temperature stress from 20 to 90°C.
Anthocyanin microcapsules exhibited 280 mg/L of anthocyanins with pink, red coloration, maintaining 50% of anthocyanins during storage for 180 days at 20 °C. Color stability was observed at 2-7 pH range and temperature stress from 20 to 75°C.
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Hernández-Acosta, E., Muro, C., Guadarrama-Lezama, A.Y. et al. Valorization of Black Carrot Industrial Residues for the Anthocyanin Pigment Production. Waste Biomass Valor 15, 4071–4086 (2024). https://doi.org/10.1007/s12649-024-02424-4
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DOI: https://doi.org/10.1007/s12649-024-02424-4